261647454247455 has 8 divisors (see below), whose sum is σ = 418635926795952. Its totient is φ = 139545308931968.

The previous prime is 261647454247441. The next prime is 261647454247489. The reversal of 261647454247455 is 554742454746162.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 261647454247455 - 2⁶ = 261647454247391 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8721581808234 + ... + 8721581808263.

It is an arithmetic number, because the mean of its divisors is an integer number (52329490849494).

Almost surely, 2^{261647454247455} is an apocalyptic number.

261647454247455 is a deficient number, since it is larger than the sum of its proper divisors (156988472548497).

261647454247455 is a wasteful number, since it uses less digits than its factorization.

261647454247455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17443163616505.

The product of its digits is 903168000, while the sum is 66.

The spelling of 261647454247455 in words is "two hundred sixty-one trillion, six hundred forty-seven billion, four hundred fifty-four million, two hundred forty-seven thousand, four hundred fifty-five".